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Is Cystine Halal?

Also known as: L-cystine, Oxidized form of cysteine

⚠ Varies by Source

Source & Ruling

SourceHalal Ruling
Human HairHaram — same concerns as L-cysteine (E920)
Poultry Feathers HalalHalal — from halal-slaughtered poultry
SyntheticHalal — produced by fermentation

Detailed Explanation

L-cystine is the oxidized (dimer) form of L-cysteine and shares the same sources and halal concerns. It is used in supplements and food processing. The same source concerns apply as for L-cysteine.

How to Identify

Listed as 'L-cystine' or 'cystine'. Often confused with cysteine.

Halal Alternatives

Commonly Found In

Related Ingredients

Varies by Source Gelatin Varies by Source Animal Rennet Varies by Source Glycerin / Glycerol Varies by Source Stearic Acid Varies by Source Magnesium Stearate

Frequently Asked Questions

Is Cystine halal or haram?+
The halal status of Cystine is classified as Varies by Source. L-cystine is the oxidized (dimer) form of L-cysteine and shares the same sources and halal concerns. It is used in supplements and food processing. The same source concerns apply as for L-cysteine....
What is Cystine made from?+
Cystine can come from the following sources: Human Hair, Poultry Feathers Halal, Synthetic. L-cystine is the oxidized (dimer) form of L-cysteine and shares the same sources and halal concerns. It is used in supplements and food processing. Th...
What are halal alternatives to Cystine?+
Halal alternatives to Cystine include: Fermentation-produced cystine.